package org.spring.springboot.util;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

public class IpUtil {

	
	/**
	 * 获取当前网络ip
	 * @param request
	 * @return
	 */
	public static String getIpAddr(HttpServletRequest request){

		String ipAddress  = request.getHeader("X-Real-IP");
		if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
				request.getHeader("x-forwarded-for");
		}
		if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getRemoteAddr();
			if(ipAddress != null && ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){
				//根据网卡取本机配置的IP
				InetAddress inet=null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {
					e.printStackTrace();
				}
				if(inet!=null){
					ipAddress= inet.getHostAddress();
				}
			}
		}
		//对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15
			if(ipAddress.indexOf(",")>0){
				ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));
			}
		}
		return ipAddress; 
	}
}
